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The Surefire Stove Sentry interfaces between a pellet stove or kerosene heater and the AC electrical supply.

SF 503B interfaces between a heating appliance (wood pellet or alternative fuel stove) and its AC wall outlet. When AC utility power is present, the SF 503B charges a battery and monitors the wall outlet to detect a power outage. At the moment utility power fails, the SF 503B draws energy from a battery and converts it to enable appliance operation. When utility power returns, the SF 503B automatically switches the appliance back to AC wall outlet power. At the same time, the SF 503B resumes charging the battery to return it to full capacity in preparation for the next power failure.

This is same product as the stove companies are selling at a LOWER Cost!

When electricity is present the Surefire Stove Sentry charges a battery and surveys the power line. At the instant that a power failure occurs, the Surefire Stove Sentry converts the energy stored in the battery to AC power. This assures operation of the pellet stove or kerosene heater without interruption during the absence of electricity.

When AC utility power is restored, the Surefire Stove Sentry reinstates AC utility power as the prime energy source to operate the pellet stove or kerosene heater. Simultaneously and automatically the Surefire Stove Sentry commences the recharging of the battery, to return it to full capacity in preparation for the next power failure.

At sites where utility power is not present, the user should determine if there is a sufficient reserve of battery capacity to enable the pellet stove or kerosene heater to operate for the desired time period. Consult the Surefire Stove Sentry operating manual for data relating the size and number of batteries needed.

Back Up Mode Operation (Supplying Battery Power) Maximum Back Up Power 750 Watts Maximum Input Current 70 A

Factory Warranty 1 year Dimensions (L x W x H) in. 17 x 7 x 3 Weight (lbs.) 16 Models SF 707 and SF 709 will operate most pellet stoves. The user should ensure that his stove's power consumption is less than the maximum back up power specifications of the stove/heater sentry.

How to Calculate Backup Operating Time

Determining operating time requires the following inputs:

a) The size of the battery bank

i.e. its total Ampere-Hour (A-hr) capacity

Ampere-Hour capacity is calculated by adding the A-hr ratings

of all of the batteries in the battery bank where the batteries are

connected in parallel.

(For Parallel Connection See Fig. #1)

b) The current draw for the sentry in Amps (C).

This can be computed by summing all of the electrical loads

which the sentry is expected to operate

c) The average operating duty cycle of the system

The duty cycle of a system is the ratio of its "on" time

e.g. if a water circulation pump will work for one minute and is

then off for two minutes, its duty cycle is calculated as follows:

e.g. in the case of a pellet stove which has no off time

d) Once (a) (b) and (c) are known the operating time of

the sentry (in hours) can be calculated by the formula:

e.g. for a system with 3 batteries each rated 90 A-hr.

1) 3 batteries each rated 90 A-hr., A-hr = 3 x 90

2) A load that draws 4 Amps, C=4

3) Duty cycle which operates 1 minute "on" followed

by 3 minutes "off", D = 1/(1+3) = 0.25

T (Hours)= (3 x 90)/(4 x 10 x 0.25) = 27

A 12 volt, deep cycle marine battery up to 200 amps needs to be purchased separately. These can be found at most auto parts stores.

A 12 volt, deep cycle marine battery up to 200 amps needs to be purchased separately. These can be found at most auto parts stores.

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